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The epidemiological investigation performed among the persons that consumed the meal identified chicken salad as the most likely source of the outbreak. <jats:italic>Staphylococcus aureus<\/jats:italic> was isolated from a total of seven samples, namely one vomit sample from a guest of the nursing home, two food samples (chicken salad with and without mayonnaise) and nasal swabs collected from a total of four persons working in the kitchen of the nursing home. The maximum likelihood tree obtained using single nucleotide polymorphisms analysis revealed that the isolates from the aforementioned samples clustered together. Multilocus sequence typing revealed that they belonged to Sequence Type 72. Fourier transform infrared spectroscopy (FTIR) was used in parallel to single nucleotide polymorphisms and whole genome sequencing for the determination of the degree of relatedness of the isolates. The results of the FTIR showed the same clustering obtained with single nucleotide polymorphisms and whole genome sequencing and revealed the source of infection. This study underlines the importance of both laboratory evidence and epidemiological data for outbreak investigation and further confirms that FTIR is a suitable support for the short\u2010term epidemiological investigation on source attribution in case of a <jats:italic>S.\u2009aureus<\/jats:italic> infection.<\/jats:p>","DOI":"10.1111\/zph.13046","type":"journal-article","created":{"date-parts":[[2023,5,11]],"date-time":"2023-05-11T06:15:31Z","timestamp":1683785731000},"page":"411-419","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["Investigation of a <i>Staphylococcus aureus<\/i> sequence type 72 food poisoning outbreak associated with food\u2010handler contamination in Italy"],"prefix":"10.1111","volume":"70","author":[{"given":"Federica","family":"Savini","sequence":"first","affiliation":[{"name":"Dipartimento di Scienze Mediche Veterinarie Universit\u00e0 di Bologna  Ozzano Emilia Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6976-803X","authenticated-orcid":false,"given":"Angelo","family":"Romano","sequence":"additional","affiliation":[{"name":"Istituto Zooprofilattico Sperimentale del Piemonte Liguria e Valle d'Aosta, SC Sicurezza e Qualit\u00e0 degli Alimenti  Torino Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1168-4826","authenticated-orcid":false,"given":"Federica","family":"Giacometti","sequence":"additional","affiliation":[{"name":"Dipartimento di Scienze Mediche Veterinarie Universit\u00e0 di Bologna  Ozzano Emilia Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Valentina","family":"Indio","sequence":"additional","affiliation":[{"name":"Dipartimento di Scienze Mediche Veterinarie Universit\u00e0 di Bologna  Ozzano Emilia Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Monica","family":"Pitti","sequence":"additional","affiliation":[{"name":"Istituto Zooprofilattico Sperimentale del Piemonte Liguria e Valle d'Aosta, SC Sicurezza e Qualit\u00e0 degli Alimenti  Torino Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lucia","family":"Decastelli","sequence":"additional","affiliation":[{"name":"Istituto Zooprofilattico Sperimentale del Piemonte Liguria e Valle d'Aosta, SC Sicurezza e Qualit\u00e0 degli Alimenti  Torino Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pietro Luigi","family":"Devalle","sequence":"additional","affiliation":[{"name":"Dipartimento di Prevenzione \u2013 Azienda Sanitaria Locale CN1 SC Igiene Degli Alimenti e Nutrizione  Cuneo Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ilaria Silvia Rossella","family":"Gorrasi","sequence":"additional","affiliation":[{"name":"Dipartimento di Prevenzione \u2013 Azienda Sanitaria Locale CN1 SC Igiene Degli Alimenti e Nutrizione  Cuneo Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sergio","family":"Miaglia","sequence":"additional","affiliation":[{"name":"Dipartimento di Prevenzione \u2013 Azienda Sanitaria Locale CN1 SC Igiene Degli Alimenti e Nutrizione  Cuneo Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrea","family":"Serraino","sequence":"additional","affiliation":[{"name":"Dipartimento di Scienze Mediche Veterinarie Universit\u00e0 di Bologna  Ozzano Emilia Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2023,5,10]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1093\/nar\/gkw343"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1128\/JCM.44.2.619\u2010621.2006"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.4315\/0362\u2010028X\u201063.3.381"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.3390\/toxins2071751"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.foodcont.2021.108362"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1093\/bioinformatics\/btu170"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.4315\/0362\u2010028X\u201060.5.567"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1128\/JCM.02402\u201006"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0077302"},{"key":"e_1_2_8_11_1","first-page":"1","volume-title":"Detection of genes encoding Staphylococcal enterotoxins multiplex PCR for sea to see and Ser. 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